a. (Anat.) Pertaining to the dura, or dura mater. [ 1913 Webster ]
prop. n. [ a trademark. ] an aluminum-based alloy which is both light and strong, containing 4 per cent of copper and 0.5 per cent of magnesium and smaller amounts of iron, manganese, and silicon. It hardens with aging at room temperature. [ WordNet 1.5 +PJC ]